,Chapter01:Introduction
x x
1. A tentative explanation for a set of observations that can be tested by further
x x x x x x x x x x x x x
experimentation is referred to as
x x x x x
A) a hypothesis. B) a law. C) a theory. D) none oftheabove.
x x x x x x x
Ans: A Category: Easy Section: 1.2
x x x x
2. A concise verbal or mathematical statement of a relationship between phenomena that is
x x x x x x x x x x x x
always the same under the same conditions is referred to as
x x x x x x x x x x x
A) a hypothesis. B) a law. C) a theory. D) none oftheabove.
x x x x x x x
Ans: B Category: Easy Section: 1.2
x x x x
3. A unifying principle that explains a body of facts and relations is referred to as
x x x x x x x x x x x x x x
A) a hypothesis. B) a law. C) a theory. D) none oftheabove.
x x x x x x x
Ans: C Category: Easy Section: 1.2
x x x x
4. Complete the following sentence. A hypothesis is
x x x x x x
A) a tentative explanation for a set of observations that can be tested by further
x x x x x x x x x x x x x
experimentation.
x
B) a statement describing a relationship between phenomena that is always the same
x x x x x x x x x x x
under the same conditions.
x x x x
C) a unifying principle that explains a body of facts and relations.
x x x x x x x x x x
D) amodel used to visualize theinvisible. x x x x
Ans: A Category: Easy Section: 1.2
x x x x
5. Complete the following sentence. A scientific law is
x x x x x x x
A) a tentative explanation for a set of observations that can be tested by further
x x x x x x x x x x x x x
experimentation.
x
B) a statement describing a relationship between phenomena that is always the same
x x x x x x x x x x x
under the same conditions.
x x x x
C) a unifying principle that explains a body of facts and relations.
x x x x x x x x x x
D) amodel used to visualize theinvisible. x x x x
Ans: B Category: Easy Section: 1.2
x x x x
6. Complete the following sentence. A theoryis
x x x x x x
A) a tentative explanation for a set of observations that can be tested by further
x x x x x x x x x x x x x
experimentation.
x
B) a statement describing a relationship between phenomena that is always the same
x x x x x x x x x x x
under the same conditions.
x x x x
C) a unifying principle that explains a body of facts and relations.
x x x x x x x x x x
D) amodel used to visualize theinvisible. x x x x
Ans: C Category: Easy Section: 1.2
x x x x
Page 1 x
, Chapter 01: Introduction x x
7. Choose the response that includes all the items listed below that are pure substances.
x x x x x x x x x x x x x
i. orange juice ii. steam iii. ocean water iv. oxygen v. vegetable soup
x x x x x x x x
A) i, iii, vx x B) ii, iv C) i, iii, iv D) iv only
x E) x x x x x x x
x all of them arepure Ans: B Category: Easy
x x x Section: 1.2 x x x x
8. Which of the following is an example of a physical property?
x x x x x x x x x x
A) corrosiveness of sulfuric acid x x x
B) toxicity of cyanide x x
C) flammability of gasoline x x
D) neutralization of stomach acid with an antacid x x x x x x
E) lead becomesa liquid whenheatedto601 C x x x x x
Ans: E Category: Easy Section: 1.4
x x x x
9. Which one of the following is an example of a physical property?
x x x x x x x x x x x
A) dynamite explodes D) ice floats on top of liquid water
x x x x x x x
B) meat rots if it is not refrigerated E) x a silver platter tarnishes
x x x x x x x x
C) gasoline burns x
Ans: D Category: Easy Section: 1.4
x x x
10. Which one of the following represents a physical change?
x x x x x x x x
A) water,when heated to 100 C,forms steam x x x x x x x
B) bleach turns hair yellow x x x
C) sugar, when heated, becomes brown x x x x
D) milk turns sour x x
E) apples, when exposed toair, turn brown x x x x x x
Ans: A Category: Easy Section: 1.4
x x x x
11. All of the following are properties of sodium. Which one is a physical property of
x x x x x x x x x x x x x x
sodium?
x
A) It is a surface turns black when first exposed to air.
x x x x x x x x x x
B) It isasolid at25 C and changestoaliquidwhen heatedto98 C.
x x x x x x x x x
C) When placed in water it sizzles and a gas is formed. x x x x x x x x x x
D) When placed in contact with chlorine it forms a compound that melts at 801 C.
x x x x x x x x x x x x x x
E) Sodium is never found as the pure metal in nature. x x x x x x x x x
Ans: B Category: Easy Section: 1.4
x x x x
12. All of the following are properties of tin. Which one is a chemical property of tin?
x x x x x x x x x x x x x x x
A) Tin can be hammered into a thin sheet.
x x x x x x x
B) At–40 Casheetoftincrumblestoa graypowder. x x
C) Tin melts at 231.9 C. x x x x
D) When a bar of tin is bent, it emits an audible ―cry‖.x x x x x x x x x x x
E) Tin erodes when added to hydrochloric acid, and a clear gas forms.
x x x x x x x x x x x
Ans: E Category: Medium Section: 1.4
x x x x
Page 2 x
, Chapter 01: Introduction x x
13. Which one of the following represents a chemical change?
x x x x x x x x
A) boiling water to form steam x x x x
B) burning a piece of coal x x x x
C) heating lead until it melts x x x x
D) mixing iron filings and sand at room temperature
x x x x x x x
E) breaking glass x
Ans: B Category: Medium Section: 1.4
x x x
14. Which of the following does not represent a chemical change?
x x x x x x x x x
A) a freshly cut apple turns brown
x x x x x
B) milk turns sour on standing at room temperature
x x x x x x x
C) when cooled to0 C,liquidwaterbecomesice
x x x x x
D) frying an egg x x
E) fermentation of sugar to alcohol x x x x
Ans: C Category: Easy Section: 1.4
x x x x
15. The SI prefixes nano and deci represent, respectively:
x x x x x x x
A) 10–9and 10–6. x D) 109and 10–6.
x x
–3
6
B) 10 and 10 . E)
x 10–9and 10–1. x x
C) 103and 10–3. x
Ans: E Category: Easy Section: 1.7
16. The SI prefixes milli and mega represent, respectively:
x x x x x x x
A) 106and 10–6. D) 10–3and 109.
x x
B) 10–3and 106. E) 10–6and 10–3.
x x x
3 –6
C) 10 and 10 . x
Ans: B Category: Easy Section: 1.7
17. The SI prefixes
x kilo and centi represent, respectively:
x x x x x x
A) 103and 10–2. xD) 10–6and 102. x
–1
6
B) 10 and 10 . x E) 102and 10–3. x
C) 10–3and 10–2. x x
Ans: A Category: Easy Section: 1.7
18. A nanometer corresponds to:
x x x
A) 10–2meters. x D) 10–9meters.
x
–3
B) 10 meters. x E) 10–12 meters.
x
C) 10–6meters. x
Ans: D Category: Easy Section: 1.7
x x x
19. A microliter corresponds to:
x x x
A) 10– 2 liters. B) 10– 3 liters. C) 10– 6 liters. D) 10– 9 liters. E) 10–12liters.
x x x x x x x x x x x x
Ans: C Category: Easy Section: 1.7
x x x x
Page 3 x
x x
1. A tentative explanation for a set of observations that can be tested by further
x x x x x x x x x x x x x
experimentation is referred to as
x x x x x
A) a hypothesis. B) a law. C) a theory. D) none oftheabove.
x x x x x x x
Ans: A Category: Easy Section: 1.2
x x x x
2. A concise verbal or mathematical statement of a relationship between phenomena that is
x x x x x x x x x x x x
always the same under the same conditions is referred to as
x x x x x x x x x x x
A) a hypothesis. B) a law. C) a theory. D) none oftheabove.
x x x x x x x
Ans: B Category: Easy Section: 1.2
x x x x
3. A unifying principle that explains a body of facts and relations is referred to as
x x x x x x x x x x x x x x
A) a hypothesis. B) a law. C) a theory. D) none oftheabove.
x x x x x x x
Ans: C Category: Easy Section: 1.2
x x x x
4. Complete the following sentence. A hypothesis is
x x x x x x
A) a tentative explanation for a set of observations that can be tested by further
x x x x x x x x x x x x x
experimentation.
x
B) a statement describing a relationship between phenomena that is always the same
x x x x x x x x x x x
under the same conditions.
x x x x
C) a unifying principle that explains a body of facts and relations.
x x x x x x x x x x
D) amodel used to visualize theinvisible. x x x x
Ans: A Category: Easy Section: 1.2
x x x x
5. Complete the following sentence. A scientific law is
x x x x x x x
A) a tentative explanation for a set of observations that can be tested by further
x x x x x x x x x x x x x
experimentation.
x
B) a statement describing a relationship between phenomena that is always the same
x x x x x x x x x x x
under the same conditions.
x x x x
C) a unifying principle that explains a body of facts and relations.
x x x x x x x x x x
D) amodel used to visualize theinvisible. x x x x
Ans: B Category: Easy Section: 1.2
x x x x
6. Complete the following sentence. A theoryis
x x x x x x
A) a tentative explanation for a set of observations that can be tested by further
x x x x x x x x x x x x x
experimentation.
x
B) a statement describing a relationship between phenomena that is always the same
x x x x x x x x x x x
under the same conditions.
x x x x
C) a unifying principle that explains a body of facts and relations.
x x x x x x x x x x
D) amodel used to visualize theinvisible. x x x x
Ans: C Category: Easy Section: 1.2
x x x x
Page 1 x
, Chapter 01: Introduction x x
7. Choose the response that includes all the items listed below that are pure substances.
x x x x x x x x x x x x x
i. orange juice ii. steam iii. ocean water iv. oxygen v. vegetable soup
x x x x x x x x
A) i, iii, vx x B) ii, iv C) i, iii, iv D) iv only
x E) x x x x x x x
x all of them arepure Ans: B Category: Easy
x x x Section: 1.2 x x x x
8. Which of the following is an example of a physical property?
x x x x x x x x x x
A) corrosiveness of sulfuric acid x x x
B) toxicity of cyanide x x
C) flammability of gasoline x x
D) neutralization of stomach acid with an antacid x x x x x x
E) lead becomesa liquid whenheatedto601 C x x x x x
Ans: E Category: Easy Section: 1.4
x x x x
9. Which one of the following is an example of a physical property?
x x x x x x x x x x x
A) dynamite explodes D) ice floats on top of liquid water
x x x x x x x
B) meat rots if it is not refrigerated E) x a silver platter tarnishes
x x x x x x x x
C) gasoline burns x
Ans: D Category: Easy Section: 1.4
x x x
10. Which one of the following represents a physical change?
x x x x x x x x
A) water,when heated to 100 C,forms steam x x x x x x x
B) bleach turns hair yellow x x x
C) sugar, when heated, becomes brown x x x x
D) milk turns sour x x
E) apples, when exposed toair, turn brown x x x x x x
Ans: A Category: Easy Section: 1.4
x x x x
11. All of the following are properties of sodium. Which one is a physical property of
x x x x x x x x x x x x x x
sodium?
x
A) It is a surface turns black when first exposed to air.
x x x x x x x x x x
B) It isasolid at25 C and changestoaliquidwhen heatedto98 C.
x x x x x x x x x
C) When placed in water it sizzles and a gas is formed. x x x x x x x x x x
D) When placed in contact with chlorine it forms a compound that melts at 801 C.
x x x x x x x x x x x x x x
E) Sodium is never found as the pure metal in nature. x x x x x x x x x
Ans: B Category: Easy Section: 1.4
x x x x
12. All of the following are properties of tin. Which one is a chemical property of tin?
x x x x x x x x x x x x x x x
A) Tin can be hammered into a thin sheet.
x x x x x x x
B) At–40 Casheetoftincrumblestoa graypowder. x x
C) Tin melts at 231.9 C. x x x x
D) When a bar of tin is bent, it emits an audible ―cry‖.x x x x x x x x x x x
E) Tin erodes when added to hydrochloric acid, and a clear gas forms.
x x x x x x x x x x x
Ans: E Category: Medium Section: 1.4
x x x x
Page 2 x
, Chapter 01: Introduction x x
13. Which one of the following represents a chemical change?
x x x x x x x x
A) boiling water to form steam x x x x
B) burning a piece of coal x x x x
C) heating lead until it melts x x x x
D) mixing iron filings and sand at room temperature
x x x x x x x
E) breaking glass x
Ans: B Category: Medium Section: 1.4
x x x
14. Which of the following does not represent a chemical change?
x x x x x x x x x
A) a freshly cut apple turns brown
x x x x x
B) milk turns sour on standing at room temperature
x x x x x x x
C) when cooled to0 C,liquidwaterbecomesice
x x x x x
D) frying an egg x x
E) fermentation of sugar to alcohol x x x x
Ans: C Category: Easy Section: 1.4
x x x x
15. The SI prefixes nano and deci represent, respectively:
x x x x x x x
A) 10–9and 10–6. x D) 109and 10–6.
x x
–3
6
B) 10 and 10 . E)
x 10–9and 10–1. x x
C) 103and 10–3. x
Ans: E Category: Easy Section: 1.7
16. The SI prefixes milli and mega represent, respectively:
x x x x x x x
A) 106and 10–6. D) 10–3and 109.
x x
B) 10–3and 106. E) 10–6and 10–3.
x x x
3 –6
C) 10 and 10 . x
Ans: B Category: Easy Section: 1.7
17. The SI prefixes
x kilo and centi represent, respectively:
x x x x x x
A) 103and 10–2. xD) 10–6and 102. x
–1
6
B) 10 and 10 . x E) 102and 10–3. x
C) 10–3and 10–2. x x
Ans: A Category: Easy Section: 1.7
18. A nanometer corresponds to:
x x x
A) 10–2meters. x D) 10–9meters.
x
–3
B) 10 meters. x E) 10–12 meters.
x
C) 10–6meters. x
Ans: D Category: Easy Section: 1.7
x x x
19. A microliter corresponds to:
x x x
A) 10– 2 liters. B) 10– 3 liters. C) 10– 6 liters. D) 10– 9 liters. E) 10–12liters.
x x x x x x x x x x x x
Ans: C Category: Easy Section: 1.7
x x x x
Page 3 x
